Likely smoky quartz pendant
Smoky quartz, silicon dioxide (SiO₂), quartz variety colored by irradiation-related defects
gemstone
Category
Mineral (Man Made Glass)
Browse mineral (man made glass) specimens identified by the Rock Identifier community.
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Fossil Shark Tooth
Lamniform (Mackerel Shark) fossil tooth, likely Otodus or Cretalamna
fossil
Faceted Glass (Costume Jewelry)
Amorphous Silicon Dioxide with colorants (Glass)
Synthetic/Man-made Material
Green Quartzite
Metamorphic Quartz Sandstone (SiO2)
metamorphic
Sandstone (Red/Brown Variety)
Arenite (composed primarily of SiO2 with Fe2O3 iron oxide inclusions)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Ruby in Matrix
Corundum (Al2O3)
mineral
Tumbled milky quartz pebble
Quartz (SiO₂), likely milky quartz
mineral
Red jasper (likely)
Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored red by iron oxides
mineral
Gypsum (Satin Spar / Alabaster variety)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Tumbled chert or jasper pebble
Microcrystalline quartz (SiO₂), likely chert/jasper
sedimentary
Artificial Rock Face (Faux Rock)
Glass Fiber Reinforced Concrete (GFRC)
man-made/construction material
Rounded gray pebble, likely quartzite
Quartzite (predominantly crystalline quartz, SiO₂); identification is tentative from the image
metamorphic
Chert Nodule
Microcrystalline Quartz (SiO2)
sedimentary
Chert (specifically Flint)
Chert (SiO2)
sedimentary
Tumbled milky chalcedony (likely common opal or quartz-rich chalcedony)
Chalcedony, microcrystalline SiO₂; identification is uncertain from the photo
mineral
Tumbled yellow chalcedony (possibly citrine or pale agate)
Chalcedony, microcrystalline quartz (SiO₂); exact variety cannot be confirmed visually
mineral
Chert
Chert (SiO2)
sedimentary
Likely gold-colored metal ring with a possible gemstone
Uncertain; possibly gold alloy (Au) with a small quartz or glass-like setting
mineral
Chert (varieties include Flint and Jasper)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Flint
SiO2 (Microcrystalline Quartz)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartz Rock (SiO2)
metamorphic
Red-and-brown agate bead bracelet
Agate, a microcrystalline variety of quartz (SiO₂), likely colored chalcedony/carnelian
mineral
Quartz
Silicon dioxide (SiO₂)
Mineral
Slag (Industrial Glass/Metal)
Ferrous slag or Glassy silicate byproduct
Antropogenic rock (Man-made)
Sandstone
Arenite (with iron oxide cement)
sedimentary
Basalt
Basalt
Igneous
Quartzite
Metamorphic Quartzite (primarily SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (primarily SiO2)
metamorphic
Gold coin pendant on a chain
Gold (Au), likely a coin set in a gold-colored metal mount
mineral
Quartz geode with druzy crystals
Quartz (SiO₂), likely with iron-oxide staining and darker host rock
mineral
Aventurine
Aventurine Quartz (SiO2 with inclusions of Fuchsite)
metamorphic
Tiger Shark Fossil Tooth
Galeocerdo cuvier (fossilized)
sedimentary
Diamond-set gold ring
Diamond (carbon, C) in a gold alloy setting; the clear center stone may be a diamond or a diamond simulant
gemstone
Polished stone sphere, possibly agate or jasper
Likely microcrystalline quartz (SiO₂); exact variety cannot be confirmed from the image
mineral
Flint
Silicon dioxide (Microcrystalline Quartz / Chert)
sedimentary
Quartzite
Quartzite (Metamorphosed Sandstone)
metamorphic
Chert
Microcrystalline quartz (SiO2)
sedimentary
Likely sandstone pebble
Quartz-rich sandstone (composition uncertain from the image)
sedimentary